Tool for grinding glass plates.



Nd. 809,499. PATENTED JAN. 9, 1906. F. FRANZ.

TOOL FOR GRINDING GLASS PLATES.

APPLICATION FILED JAN. 31 1905;

UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Application filed January 31, 1905. Serial No. 243,495.

Patented Jan. 9, 1906.

To all whom it may concern.-

Be it known that I, FRIEDERIOH FRANZ, a subject of the German Emperor, and a resident of Corona, Long Island, in the county of Queens and State of New York, have invented certain new and useful Improvements in Tools for Grinding Glass Plates, of which the following is a specification.

The present invention relates to improvements in a tool for grinding glass plates, mirrors, or the like, and has for its object to provide for a tool by means of which borders of ornaments can be ground in glass plates.

The invention is illustrated in the accompanying drawings, in which similar reference-letters denote corresponding parts, and in which Figure 1 is a plan of the tool; Fig. 2, a side elevation thereof; Fig. 3, a modified form thereof. Figs. 4, 5, 6 are further modified forms of the individual plates of which the tool is composed. Fig. 7 shows the tool in operation, and Fig. 8 a sample pattern of an ornamental border in a glass or mirror plate.

With reference to-the drawings, a b 0 (Z e are a number of metal plates of which the tool is to be composed. These plates may have any suitable length, whereas their thickness must correspond with that of the lines of the pattern to be ground in the glass plates. A number of sets of such metal plates of equal anddiiferent thicknesses may be prepared, and for each new pattern a corresponding selection may be made of the various plates, which selected plates may be then connected to form the tool-for the respective pattern. To allow of the plates being readily connected with each other, each individual plate may be provided with a central hole or holes f, through which when w the plates are placed on the top of each other a screw-bolt 9 can be passed, having a head it at one end, and nuts 9 may be screwed on its opposite end, so as to tighten the connection. The upper and lower edges m serve as the cutting edges of the plates, which when a set of plates are connected together are level with each other or lie in a plane. These edges may differ in their shape according to the cuts or lines desired to be round in the glass. In Fig. 2 the edges are at and only slightly sloped at their sides to form narrower or broader spaces between the various lines constituting the ornamental border to be ground in the glass. In Fig. 4

the edges are shown pointed and in Fig. 5 cylindrically curved to form corresponding cuts in the plate-glass.

The vertical or side edges of each individual metal plate are out under an angle equal to one-half of the full angle formed by two. adjoining sides of the m rror, provided the latter is given the shape of a right angle, triangle, or rhomboid, whereby when grinding the glass plate the corners x will be formed. For circular or any other curved ornamental borders the metal plates a b c d 6 must be correspondingly curved, as shown in Fig. 3, while the side edges m m of each individual metal plate of the tool maybe cut so as to extend radially.

For patterns in which the lines are interrupted to produce the eflect of diamond-settings, as shown at w in Fig. 8, the metal plate may have one of its side edges Zcut as above stated and its opposite side edge p out so as to correspond with one-half of the circumference of the diamond figure to be produced.

In practice my new tool is used in the following manner: Upon a table gthe glass plate or mirror 8 is placed, and on the top of the mirror, around the edges of the latter, a frame 1' is placed corresponding in its circumferential shape with the pattern of the ornamental borders to be ground in the glass. This frame, which is to serve as a guide for the tool, is in any convenient manner clamped to the operating-table, thus also securing the mirror or glass plate upon the latter. After a selection of a number of metal plates, according to the pattern desired is made and said plates connected in the aforesaid manner and after the working surface of the glass plate has been covered with a layer of emery, sand, or any other abrasive substance, the tool A is placed onto the glass plate with its upper or lower cutting edges to rest upon the latter and to lean against the guide-frame 1'. By moving the tool along the inner edges of the guideframe the pattern t will be cut in the glass plate. In case of an angular border the tool will be first moved along in the direction of the arrow 1) from one corner to the other and then turned around and moved in the direction of the arrow y, Fig. 8. If a diamond setting or the pattern to is to be produced, the tool will be shifted from one corner up to the line 1/. and then turned around and moved from the opposite corner in the opposite direction toward said line u.

It has been found that by the present arrangement of the tool the grinding of various patterns for ornamental borders on glass plates, mirrors, or the like is greatly simplified and the price therefor exceedingly decreased.

It is evident that instead of working the tool by hand, as assumed in the example shown, this can be done by mechanical, electrical, or any other means, in which cases, however, a special means will be necessary for the transmission of the movement from the mechanical or other means to the said tool. As this, however, does not form a part of my invention, I will not describe nor show it in the present application.

What I claim and desire to secure by Letters Patent is 1. A tool for grinding glass plates, mirrors or the like, comprising a series of blades placed side by side, the thickness of each of said blades and the shape of the upper and lower edges thereof corresponding with the respective line to be ground, said upper and lower edges serving as the cutting edges of the tool, the vertical side edges of each blade being sloped rearward and outward rendering the front surface narrower than the rear surface thereof, and means for fastening the blades to each other after adjustment, substantially and for the purpose as specified.

2. A tool for grinding glass plates, mirrors or the like, comprising a series of blades placed side by side, the thickness of each of said blades and the shape of the upper and lower edges thereof corresponding with the respective line to be ground, said upper and lower edges serving as the cutting edges of the tool, one of the vertical side edges of each blade being sloped rearward and outward and the other being cut so as to conform with a portion of any figure desired to represent a setting, and means for fastening the blades to each other after adjustment, substantially and for the purpose as specified.

Signed at New York, in the county of New York and State of New York, this 28th day of January, A. D. 1905.

FRIEDERICH FRANZ.

Witnesses:

MAX D. ORDMANN, HERBERT M. JOHNSTON. 

